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The Global Insight

Why sunk cost is not considered for capital budgeting?

Author

James Olson

Updated on February 22, 2026

In both economics and business decision-making, sunk cost refers to costs that have already happened and cannot be recovered. Sunk costs are excluded from future decisions because the cost will be the same regardless of the outcome.

Should sunk cost be included in capital budgeting?

Capital budgeting decisions are based on current and future incremental cash flows and not any past cash flows. Therefore, in calculating net initial investment outlay, analysts need to ignore the sunk costs but include opportunity costs in their analysis.

Should sunk costs be ignored in capital budgeting?

Sunk costs: Any expense that has been incurred already, and cannot be recovered if the project is not taken, is a sunk cost (usually R&D, test market expenses, etc.). Always ignore sunk costs in project analysis.

Should sunk costs be included in the cash flow of a project?

Since sunk costs are costs the firm has already incurred, they shouldn’t be included in future cash flows. The $50,000 is a sunk cost that occurred in the past and shouldn’t be included in the cash outflows for determining project profitability.

What is not included in capital budgeting?

Unlike some other types of investment analysis, capital budgeting focuses on cash flows rather than profits. Conversely, non-cash expenses like depreciation are not included in capital budgeting (except to the extent they impact tax calculations for “after tax” cash flows) because they are not cash transactions.

What should be ignored in capital budgeting?

Only incremental cash flows are relevant to the capital budgeting process, while sunk costs. Sunk costs are independent of any event and should not should be ignored. This is because sunk costs have already occurred and had an impact on the business’ financial statements.

Why sunk cost are considered irrelevant cost?

A sunk cost is a cost that cannot be recovered or changed and is independent of any future costs a business might incur. Because a decision made today can only impact the future course of business, sunk costs stemming from earlier decisions should be irrelevant to the decision-making process.

When do you not include sunk costs in a budget?

In business, sunk costs are typically not included in consideration when making future decisions, as they are seen as irrelevant to current and future budgetary concerns.

What is the difference between sunk costs and opportunity costs?

Sunk Costs vs Opportunity Costs. In capital budgeting analysis, sunk costs are costs which are already incurred and which need not be reflected in the incremental cash flows used for estimation of net present value and internal rate of return. Sunk costs are named so because they can’t be recovered.

Is the price of a concert a sunk cost?

Suppose you buy a ticket to a concert for $150. On the night of the concert, you remember that you have an important assignment due on the same night. You must make a decision: go to the concert or finish your assignment. The $150 paid for the ticket is a sunk cost and should not affect your decision.

Why do you need to ignore the Sunk Cost Fallacy?

The company should not continue with the product launch and the initial marketing study investment should not be considered when making decisions. The sunk cost fallacy reasoning states that further investments or commitments are justified because the resources already invested will be lost otherwise.